Device to facilitate the arming of an alarm system and to provide lock-out protection

Abstract

A burglarproof device which can facilitate the activation of an alarm system and can provide lock-out protection. It uses a set of correct-signal generating reed switches and a set of incorrect-signal generating reed switches to activate the alarm signal, and the input of a correct signal within the preset lock-out time after receipt of an incorrect signal will not be able to open the door lock or disarm the alarm system.

What is claimed is: 
     
       1. A device to facilitate the activation of an alarm system, including a first set of reed switches operable to generate a correct signal and a second set of reed switches operable to generate an incorrect signal, a driving circuit to arm the alarm system in response to either said correct or said incorrect signal and responsive to said correct signal when the alarm system is armed to disarm the alarm system, and a correct signal disable timing circuit responsive to said incorrect signal to disable said correct signal from disarming the alarm system when the correct signal is given within a preset lock-out time after the receipt of said incorrect signal. 
     
     
       2. A device to facilitate the activation of an alarm system as claimed in claim 1 wherein the first set of correct-signal generating reed switches is composed of a plurality of reed switches connected in series operable to generate said correct signal when all of the switches of said first set are closed. 
     
     
       3. A device to facilitate the activation of an alarm system as claimed in claim 1 wherein the second set of incorrect-signal generating reed switches is composed of a plurality of reed switches connected in parallel operable to generate said incorrect signal when one of the switches of said second set is closed.